Bucksaw



Patented heb. 19, 1924.,

:ERIK Bar-tras Ann ANDREW enanas, or MINNEAroLIs, .MnviiasOTA.v

BUCKSAW.

To all whom t 'may concern.' t n Be it known that we, ERIK BnR'rAs andANDREW BERTAs, citizens of the United States, residing at Minneapolis,in the county of Hennepin, and. State ot Minnesota, have inventedcertain new and 'useful Improvements in Bucksaws.; and` we do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which'itappertains to make and use the same.

Qur invention relates to saws and more particularly to bucksaws and hasJfor its object to improve the same in the several parv ticula'rshereinafter noted.

To the'above end, the invention consists Y of the novel devices andcombinations of Y devices hereinafter described and delined in theclaims. j i

V In the accompanying drawings, vwhich illustrate the invention,'likecharacters indicate like parts throughout Ithe several views. i

Referring to the drawings: j

Fig. 1 is a side elevation of the improved saw;

Fig. 2 is a view partly in elevation and partly in section illustratingthe saw as Vused in cuttingo the ends of a plurality lof boards setedgewise one upon the other;

Fig. 3 isairagmentary perspective Viewv of the front endportion of thesaw frame and attached lever and main'links;

Fig. 4c is a fragmentary vview of Vtherear end portion of the saw frameand attached main and supplemental ylinks and blade with somepartssectioned; 'y l Fig. 5 is a fragmentary perspective view of therearA endV portion'of the saw frame and attached main links; 'andl Y ,i6 is a'perspective viewof one of the pairs of supplemental links. i Thenumeral 7 indicatesa saw blade held in a framewhichfas shown, is intheform of a bow comprising telescopically Yco'nnected members 8 and 9which permit said frame to be longitudinally adjusted tohold said bladesofy different lengths. VIt is important to note that lthe frame members8 vand 9 lot l. tubular structure and oval shape cross section whichsecurely holds said members 'froni'turning in respect to 'each other.'lt will also Avbe noted that the trame member 9 is of such vertical'width las` to have aslight vertical swinging move:

-mounted in longitud i Application inea April 25, 192s.4 serial No.634,547.

nient within ythe traine member 8V andzthat said .member 8, at itsinnerend, is, slightlyf:`

contr lcted to aiorda ulcrumj' 10, oh which said me1nber9imay swing. j

To hold themeinbers ofthe trames 8V and 9 in different telescopedrelation, the frame member 9 is providedat its inner 'end-:with Iupstanding teeth 11 arranged to bite Vaga-inst the externaljsuri'ace otthe 'trame member 8 under the tension of the saw blade 7 iThe 'front endportion ofthe frame member 8,; 4

in cross section, is formed "onan expanded taper to afford a moreconvenienthand hold. For attaching the saw blade 7 tofthe rame, there isattached tothe front end of said lframe va lock;V lever 12 which'carries a .Y pair of main links 13, andaty the reari'end of'said framethere is attachedv a pair of main links 14'. Pivoted'to the r'ee'endfoteach pair of main links 13 'and lll is, afpair of supplemental links 115and Y 16, "respectively. The lock lever 12 is pivoted at 17 l to thefframe'membe'rfB 'and' is l1-shaped in cross section so as to snuglyaround and against the front edgewpo'rtion, of said Yframe member,asshov'vn fin`FigQ 1:.""The lock lever 12 extends between ftheunainvlinks 13 which arey connected,"theretofby pivots 18that are'radially'bil'setffrom the pivot 17. The otherjjeiid` portions otthemain links 13 are contracted*andtheneX- tended'parallel to' receivetherebetween the supplemental links 15, which,I as previously stated,fare pivo't'edQthereto.v /"stu d"f' 19 forms the, pivotf'betweentliemain `links 13 andsupplemental links 15,l and'whi'chstud is rigidlysecured toonev Aoif'sai'd mainlinks and'extendsthroughja'pairo'l'faligneld holes in fhefsupplementel-linksgieyinfra hjoleeo in theotherotsaid main' links.' The main links 18, l'atftlieir' pivotsvr 1 8',are suiiiciently il loose to permit their o'tl'ierf'ends tobefsepaf l"rated laterally'tojwithdraw the'stu'd 19 from 1 the' here 20 'andsupplemental links@ 15` 'and thereby release` said supplemental "links-To drawfthe mainV links '13 toward-teach :i other onto theA'supplein'ental links` 15' andf thereby hold 'the 'stud-r9 in' theihole'2Q to:

prevent lateral Adisplacenient of 'the `supplemental links 15 tromrthemain'flinks 13,`there @sapin Y Siiaably g4 v extended-slots 22 isprovided a doublehe a llA in the main links 3l; lVhen'fthe-'flock"leverl2 is' releasedand thenain li"nk"'1'3fy positioned as ,shown in Figgx,the pin 21 "mayfbe .movedin the ,$19115 22 il@ riev reverra,

and thereby release the main links 13 so that they may be spread apartto withdrai.' the stud 19 from the hole 2O and fromV the supplementallinks 15. To hold the pin 21 in the end of the slot 22, adjacent to thesupplemental links 15, and thereby hold the main links 13 fromspreading, the inner surface of the frame member 8, at its lowei` end,is beveledk or formed with a cani 23, as shown yin Fig. 1. WThesupplemental links 15 are detachably secured to the saw hlade 7 by astud 24 rigidly secured to one of said links vand arranged to extendthrough a hole in the Arespective end of said blade and a hole 25 in theother of said supplemental links. When Y the supplemental links 15 arereleased from the main links 13 they may be laterally separated torelease the saw blade 7.

The main links 14 extend within the lower end of the frame member 9through a longitudinal slot 26 and are secured to said memberbya pivot27. One'of'the main links 14 is provided with a rigid stud28 arranged toenter a hole 29 in the other of said links by va lateralmovement todetachably hold the supplemental links 16 in the same mannerV that themain links 13 hold the supplemental links 15. The width of the slot 26is such as to vhold the' main links 14 against lateral separation withthe stud 28 in the hole 29. To laterally'separate the main links 14 andthereby release the supplemental .links 16,

said main links may be turned downward -out'of the slot26 and into theopen end of the frame member 9, as shown in Fig. 4. In this 'position ofthe main links 14, the supplemental links 16 may be readily detachedtherefrom. Said supplemental links 16 are Vdetachably attached to therespective ends of the saw blade 7 in the same manner as thesupplemental links 15 are :attached thereto,

and-'one of said links is provided with a rigid stud-30 arranged `toextend through a 'hole in the saw blade 7 and a hole 31-in the other ofsaid links. t

To direct the main links 14 into the slot 26 and thereby close said mainlinks onto the supplemental linksY 16, the lowerends of the l sides ofthe frame memberV 9, at the slot 26, are beveled at 32, as shown in Fig.5.

It is important to note that both pairs vof .supplemental links 15'and16 are twisted to hold the .saw blade 7-in a plane that is obflique tothe kplane "of the frame. By thus e timbers or the like placed asindicated in Y Fig. 2, may be easily sawed or their ends cut holding`the saw blade, the ends of boards,

cih-and at which time the frame extends 0bflique :to the line of cut sothat' thesame may be freely operated and will not bend or turn the sawblade.

v To attach't-he saw blade 7 to the' frame. the

-members of said frame are first adjusted to the proper 'longitudinallength and the suppleinental links' 16 attached to the respective'terlocked with the saw bladel i. rpleinental links 15 are then appliedto the end of said blade. Said supplemental links 16 are then insertedbetween the main links 14 while separated and extending through the openend of the frame member 9. The main links 14 are then closed onto thesupplemental links 16, and the saw blade 7 and links 14 and 16 turnedinto a horizontal position. rlhis movement of the saw blade 7 carriesthe main link 14 into the slot which holds the same against lateralseparation and thereby securely holds the main links 14 interloeked withthe supplemental links 16 and saidfsuppleniental links16in- 7 Thesuprespective end of the saw blade 7 'and said supplemental linksattached to the main links 13, and at which time the leverk 12-is in areleased or depending position and the pin 21 in a retracted position toVpermit the main links 13 to be opened and theireloscd onto thesupplemental links 15l tofinterlock the saine therewith. The pin 21 isthen proi `iected in the slots 22 toward the saw blade 7 to hold themain links 13 interlooked with the supplemental links15, and saidsupplemental links 15 interlocked with the saw Yao blade 7 Finallytlie'lock lever 12 is turned u upward which carries the pivots 18outward of the pivots 17 `and places the saw blade `7 under tension, andin this position ofthe lock lever 12, the pivots 17 are above vor beyonda dead center `so as to hold ksaid vlock lever in an operativeposition,-as shown in Fig. 1. The pin 21 is heldl by the cam 23 sc 'thatit 'cannot move in the slots 22 and-therethe saw blade to the frame,said supple-y mental linksbeing'twisted to hold the'saw blade in a planethat is oblique to the plane ofthe frame. -f. l

' 2. .Tn a bucksaw, the combination withV a frame, offa'saw blade, m-ainlinks attached to the frame, andsupplemental `links Vdetachably securedto the main linksand having-means for releasahlvlholding'the saw blade,said supplementallinks being arranged to hold thesaw blade-in a planethat is oblique to the plane of the frame, said main links being adaptedto'hold theV saw blade in the plane of the frame when the supplementallinks are detached 'from the saw hlade. i f

3. .Tn a bucks'aw. the combination with a fnaiirie.` .of a saw blade, alever pivoted to one end or" the frame, means for attaching one end ofthe saw blade to the other end of the frame7 a pair of llinks pivoted tothe lever at offset points with :freedom for lateral separation, a studon one of said links arranged to interlock With the other of said linksfor holding the respective end of the sanY blade7 said links being freefor lateral separation to release the saw blade,said lever being movablefrom one position to another to place the saw blade under tension andrelease the same, and means held by the frame to prevent lateralseparation of the links when the saw blade is under tension.

4:. The structure defined in claim 3 in which the last mentioned meansis Carried by the links and arranged to be engaged by a cam surface onthe trame and held in an operative position when the lever is moved toplace the saw blade under tension.

5. In a bucksaiv, the combination With a frame, of a saw blade, a leverpivoted to one end ot' the frame, means for attaching one end of the sawblade to the other end of thel trame7 al pair of main links pivoted tothe lever at offset points7 a pair of supplemontal links releasably heldby the main inks, said supplemental links having sepa Y rableinterlocking` engagement with the re spective end of thesaW blade andheld from releasing` by the main links, and means held by the frame toprevent the main linksfrom releasing the supplementallinks. i

6. The structure defined in claimB in I which the links are beyonda-dead center when thelever is in Aa positionto hold the Y saw bla-deunder tension.

7. In a bueksangthe combination with a 'f frame, of a saivrblade5 laypair of main links pivoted Within one end of the Vframel with freedomfor lateral separation when' in one position and held by a slot in the`trame When in another position, a pair of supplemental links releasablyheld by the main i tures` Y ERIK BERTAS. ANDREW BERTAS

